When using epoxy primer it doesn't matter which goes first. Feb 14, 2020 at 7:57 AM #4 #4. The Self Etch Primer is a good first step for bare metal, or an Epoxy Primer. Some are a few hours; others allow several days. Rust-Oleum® Self Etching Primer is designed to prepare bare metal, aluminum and fiberglass surfaces to promote maximum adhesion and smoothness of the topcoat finish. Rust-Oleum® Self Etching Primer prepares bare metal, aluminium and fibreglass surfaces to promote maximum adhesion and smoothness of the top coat. Thanks for your reply. Rustoleum rattle can self-etch primer don't require filler primer, but the few Pro brands I looked up do (SEM, Eastwood). I want to fill in all the small grinding marks left from the manufacturing process. Self Etching Primer … It is also sold as an aerosol mixture, which can be used as simply as spray paint. When using etch primer the filler should go on to the bare metal first and then all is covered with etch primer. The tell-tale feature will be on the description of the paint container, specifically identifying the self-etching feature included in the paint. Hello, i was wondering which of these will be best for my floor pans and other chassis parts. That etches into the metal and then the primer chemically bonds to it. A note about self-etching primer and aluminum. It can’t be an epoxy primer, but it can be a urethane primer. Your self etch primer should be just a really light piss coat, you don't want a thick coat, it could cause your top coats to crack over time. Self Etching Primer is a rust preventive coating that etches and primes in one coat. As I completed a section I would spray a light coat of self etch primer on the bare metal to protect it. Once applied and dried (couple of hours) Use a 3m Scotch Brite pad to knock down any nibs and then shoot the Bare metal primer over the entire Prepped(Acetone wipe down) surface. Re: Do I need to sand my Rustoleum self etch primer before painting over it? I then use a primer sealer or epoxy primer to seal up the surface then apply the top coats. You need to use self-etching primer to paint aluminum, but prep work is especially important. This helps remove sanding scratches and small surface defects. Rust-Oleum 249322 Automotive Self Etching Primer, 12 oz, Dark Green Spray Paint Self etching primer is suitable for use on bare metal, aluminum and fiberglass surfaces Oil based paint with Stops Rust formula provides rust resistant base coat for cars, trucks and other vehicles Self etching only needs to be applied to Bare Aluminum. This product is formulated to stop rust and is an essential step to achieve a professionally finished look. Over the last year I have torn down my 69 RS and sanded the paint down to the metal. If you wait more than 12 hours you should, like he said scuff down with a Red scotch pad and reapply, then prime. This will give the paint a texture to grip on to. Apply self-etching primer as a base coat. The reason being that the acid/chemicals in the etch primer "could" be trapped under the filler and cause it to break down if the filler is applied over the etch primer. The most common paint type comes in a spray can version, which is the easiest to apply. Hope this helps, Mark Self-etching primers have to have another primer over the top of them or the paint won’t adhere. Posted: Fri May 01, 2020 9:44 pm Post subject: Rustoleum farm implement vs self etching vs epoxy primer? Typically the next step is apply a primer surfacer, 2-3 coats then block sand with 320-grit. Self-etching primer frequently comes in a gray color, similar to other primer paint. Aluminum is especially difficult to paint. Yota_Ivan, Jan 31, 2020 #3. Self-etching primer adheres to tin-plated steel really well and it dries to a somewhat rough finish that makes it easy for the top coat to grab onto. 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